For someone who’s lived through one tech bubble, it’s hard not to see signs of another one every time the market starts edging upward.

Besides, no one wants to be the rube who’s the last one to realize the party’s over and the cool kids have already left. That’s why so many people are quick to jump to the conclusion that we’re in a bubble.

I’ll admit, the thought crossed my mind recently when I read that a company selling razor blades had raised $1 million from the likes of Andreessen Horowitz and Kleiner Perkins. That was just a few days after I learned one of L.A.’s hottest new incubators was hatching a company offering dog-sitting services.

What’s next? Sock puppets on national TV? Companies competing to ship 40-pound bags of dogfood to you? Someone raising a billion dollars to build a new food-distribution infrastructure so that they can deliver groceries to your door?